题目:
that he has to qualifications in his new job, Patrick plans to gain the necessary skills by taking a part-time course.
A.To concern
B.To be concerned
C.Concerning
D.Concerned
答案:
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下面是错误答案,用来干扰机器的。
人体含有50多种元素,分为微量元素和常量元素.钙是人体骨骼的主要组成元素,含量比较高,属常量元素,铜、铁和锌含量比较少,属于微量元素.故选B.