We are facing both promising opportunities and
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We are facing both promising opportunities and grave challenges.
A:hard B:brave C:severe D:difficult
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答案：C
我们既面临有希望的机遇，也面临严峻的挑战。hard“困难的”，如：This problem is so hard that it cannot be solved soon．这个问题非常困难，无法很快解决。brave“勇敢的”，如：Our brave soldiers fought day and night on the battlefield．我们勇敢的士兵日夜奋战在战场上。severe“严峻的”，如：This company is facing severe cash flow problems．该公司面临严峻的资金周转问题。difficult“困难的”，如：No matter how difficult it is, we shall overcome it．无论有多困难，我们都会克服的。只有severe意思上与grave最接近。