According to the passage, which of the following is NOT true
A. Joblessness is an economic misfortune.
B. Joblessness is a psychological disaster for the unemployed and their families.
C. Joblessness can cause the unemployed to commit suicide.
D. Joblessness is a contagious disease.
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在地下室施工时，发生的洞库照明费，应（）。
A. 在施工取费定额中考虑
B. 按所涉及子目定额人工费的40％计算
C. 按所涉及子目定额人工费与机械费之和的40％计算
D. 已包括在相应定额子目的消耗量中，不另行增加
下列有关各RNA分子的叙述，错误的是
A. mRNA分子中含有遗传密码
B. tRNA是蛋白质合成中氨基酸的载体
C. hnRNA是tRNA的前体
D. mRNA的3′末端有多聚A结构
E. rRNA参与组成核蛋白体
如果前十家VCD年销售额为1亿元，那么康佳品牌的销售额约为( )。
A. 4 300万元
B. 430万元
C. 43万元
D. 450万元
The author refers to a "conveyor belt"(L. 6, Para. 1) in order to ______.
A. illustrate the effects of movements in the upper layer of the earth
B. show how temperature differences depend on the positions of the continents
C. describe the complicated motions made possible by the ocean currents
D. account for the rising currents under min-ocean ridges
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