Studying in an English-speaking country is a very effective way to learn English.
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The success of chain schools is to some extent because of their marketing and advertising.
A. Right
B. Wrong
地球上资源分布不均匀导致国家发展的速度也不均衡。()
A. 正确
B. 错误
种群内调节的结果能够使种群趋于稳定，因此种群内的个体之间没有差异。()
A. 正确
B. 错误
Which of the following is true according to the text？
Ashanthi needs to receive gene-therapy treatment constantly.
B. Despite the huge funding, gene researches have shown few promises.
C. Therapeutic genes are carried by harmless viruses.
D. Gene-doping is encouraged by world agencies to help athletes get better scores.
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