患者男性，35岁。近中中位阻生，远中颈部可疑龋坏。现拟拔除。

以下各项检查中，对拔除最重要的是

A:龋坏程度 B:冠周牙龈有无炎症 C:对颌牙情况 D:拍X线片并作阻力分析 E:检查患者颞下颌关节情况及张口度

在某一黏性土层中采得6个试样，根据抗剪强度试验结果，经统计后得出土的抗剪强度指标的平均值，=17.5°，cm=15.0kPa，并得到相应的变异系数，=0.25，δc=0.30，试确定该土的抗剪强度指标和Ck。（　）

A:=15.9°，ck=11.3kPa B:=13.9°，ck=16.6kPa C:=13.9°，ck=11.3kPa D:=15.9°，ck=16.6kPa

如图，正方形ABCD中，CE⊥MN，∠MCE=40°，则∠ANM=（　）

A:40° B:45° C:50° D:55°

Passage Five
Temperatures on December 12
City High Low
Cleveland .................. 37° 31°
Columbia, S. C ............ 60° 27°
Columbus, Ohio ............ 41° 34°
Dallas .................... 81° 50°
Dayton. ................... 41° 33°
Decatur ................... 39° 30°
Denver .................... 49° 33°
Des Moines ................ 34° 27°
Detroit ................... 37° 28°
Dubuque ................... 30° 23°
Duluth .................... 19° 10°
Eau Claire ................ 24° 19°
El Paso ................... 79° 36°
Evansville ................ 52° 36°
Fairbanks ................. -31° -40°
Fargo ..................... 17° -2°
Flint ..................... 31° 26°
Flagstaff ................. 56° 31°
Great Falls ............... 14° 3°
Grand Rapids .............. 33° 26°
Green Ray ................. 24° 20°

What was the high temperature in Columbus, Ohio on December 12（）

A:81°. B:50°. C:41°. D:60°.

Passage Five
Temperatures on December 12
City High Low
Cleveland .................. 37° 31°
Columbia, S. C ............ 60° 27°
Columbus, Ohio ............ 41° 34°
Dallas .................... 81° 50°
Dayton. ................... 41° 33°
Decatur ................... 39° 30°
Denver .................... 49° 33°
Des Moines ................ 34° 27°
Detroit ................... 37° 28°
Dubuque ................... 30° 23°
Duluth .................... 19° 10°
Eau Claire ................ 24° 19°
El Paso ................... 79° 36°
Evansville ................ 52° 36°
Fairbanks ................. -31° -40°
Fargo ..................... 17° -2°
Flint ..................... 31° 26°
Flagstaff ................. 56° 31°
Great Falls ............... 14° 3°
Grand Rapids .............. 33° 26°
Green Ray ................. 24° 20°

What was low temperature in Flagstaff on this day（）

A:26°. B:-2°. C:3°. D:31°.

Passage Five Temperatures on December 12 City High Low Cleveland .................. 37° 31° Columbia, S. C ............ 60° 27° Columbus, Ohio ............ 41° 34° Dallas .................... 81° 50° Dayton. ................... 41° 33° Decatur ................... 39° 30° Denver .................... 49° 33° Des Moines ................ 34° 27° Detroit ................... 37° 28° Dubuque ................... 30° 23° Duluth .................... 19° 10° Eau Claire ................ 24° 19° El Paso ................... 79° 36° Evansville ................ 52° 36° Fairbanks ................. -31° -40° Fargo ..................... 17° -2° Flint ..................... 31° 26° Flagstaff ................. 56° 31° Great Falls ............... 14° 3° Grand Rapids .............. 33° 26° Green Ray ................. 24° 20°

What was low temperature in Flagstaff on this day（）

A:26°. B:-2°. C:3°. D:31°.

Passage Five Temperatures on December 12 City High Low Cleveland .................. 37° 31° Columbia, S. C ............ 60° 27° Columbus, Ohio ............ 41° 34° Dallas .................... 81° 50° Dayton. ................... 41° 33° Decatur ................... 39° 30° Denver .................... 49° 33° Des Moines ................ 34° 27° Detroit ................... 37° 28° Dubuque ................... 30° 23° Duluth .................... 19° 10° Eau Claire ................ 24° 19° El Paso ................... 79° 36° Evansville ................ 52° 36° Fairbanks ................. -31° -40° Fargo ..................... 17° -2° Flint ..................... 31° 26° Flagstaff ................. 56° 31° Great Falls ............... 14° 3° Grand Rapids .............. 33° 26° Green Ray ................. 24° 20°

What was the high temperature in Columbus, Ohio on December 12（）

A:81°. B:50°. C:41°. D:60°.

如图，已知AB是平面a的一条斜线，B为斜足，AO⊥a，O为垂足，BC是a内的一条直线，∠AB0=45°，∠OBC=45°，则直线AB和直线BC所成的角是（）．

A:45° B:60° C:90° D:120°