单选题

• 1、

  The river {{U}}widens{{/U}} considerably as it beg

• 2、

  The development of the transistor and integrated c

• 3、

  The use of the chemical may present a certain {{U}

• 4、

  Many economists have given in to the fatal {{U}}lu

• 5、

  We have got to {{U}}abide by{{/U}} the roles.

• 6、

  The children {{U}}trembled{{/U}} with fear when th

• 7、

  Although originally a German innovation, kindergar

• 8、

  In their productions, choreographers of modem danc

• 9、

  The leading astronomers of the sixteenth and seven

• 10、

  The attack on Fort Sumter near Charleston {{U}}pro

• 11、

  Illinois has produced writers such as Carl Sandbur

• 12、

  They agreed to {{U}}settle{{/U}} the dispute by pe

• 13、

  There is always excitement at the Olympic Games wh

• 14、

  The towers of a suspension bridge serve as a rigid

• 15、

  We were {{U}}shocked{{/U}} to find that Mary didn'