单项选择题A．priceB．levelC．costD．if

单项选择题A．to buyB．buyingC．having boughtD．from buying

单项选择题A．onB．byC．atD．against

单项选择题The true cause of the anxiety of the workers is that______.

单项选择题By a well-oiled cog in the machinery the author intends to render the idea that man is ______.

单项选择题The author's attitude towards industrialism might best be summarized as one of______.

单项选择题To solve the present social problems the author suggests that we should______.

单项选择题From the passage we can infer that real happiness of life belongs to ______.

单项选择题On the basis of their models, scientists are of the opinion that______.

单项选择题A concentration of carbon dioxide in the atmosphere would______.