Why do drug companies make no effort on the study of RAS？
A. Because they can"t find how medicine can take effect on RAS.
Because RAS is often mutated and changes forms.
C. Because it doesn"t seem to be of vital importance on treating cancers.
D. Because RAS binds firmly with cells and are inseparable.
查看答案
The phrase "the palace intrigue"(Line 1, Para.6)most probably means
A. the internal plot.
B. the history of a company.
C. the foundation of company.
D. the internal story.
根据《安全生产法》，关于安全生产基本规定的说法，正确的是()。
A. 安全生产工作应当建立生产经营单位负责、专业服务机构参与，管监察部门监管，行业自律和社会监督的机制
B. 国务院和具级以上地方各级人民政府对安全生产工作实施综合监督管理
C. 工会对生产经营单位的安全生产工作实施监督管理，维护职工安全生产方面的合法权益
D. 生产经营单位委托专业服务机构提供安全生产技术，管理服务的，保证安全生产的责任仍由本单位负责
What do we know about Carrel Smith？
A. He is a 63-year-old doctor studying the preventing of cancer.
B. He is working at M. D. Anderson Cancer Center and taking part in the trial.
C. He is wondering about taking selenium and vitamin E supplements in preventing cancer.
D. His ex-brother-in-law was diagnosed to have prostate cancer.
It can be inferred from the passage that the public charging infrastructure
A. is critical at the start-up stage of electric vehicles.
B. has no influence on consumers" buying interest.
C. can greatly reduce the city"s pollutant emission.
D. should support the mass adoption of electric vehicles.
微信支付 
支付宝支付