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问题 单项选择题

只能生酮的氨基酸是

A．亮氨酸

B．甘氨酸

C．谷氨酸

D．苏氨酸

E．色氨酸

答案

参考答案：A

填空题
根据短文内容，用方框中所给词的适当形式填空，有两个是多余的。
join, help, at, with, find, play, swim, look for, computer, guitar, music,  speak
 Dear Mr Smith ,
        We are Dick and Victor. We want to 1_______ summer jobs. Dick can 2_______ basketball and
volleyball, and he can 3_______, too. Victor can play the violin, the 4_______ and the drums.  We all like 5_______very much. And we are good
6 _______ kids. We know Beidaihe Kids Summer
  Camp needs 7_______ with sports, 8_______ and computers. Can we 9 _______ the Summer Camp? Please call us 10_______ 6693538.
                                                                                                                                       Best wishes.
                                                                                                                                    Dick and Victor
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选择题

下列计算正确的是（　　）

A．a2•a3=a6

B．（a3）2=a5

C．（-a2）2=a4

D．（ab2）2=ab4
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