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以谷类为主的膳食既可提供充足的能量，又可避免摄入过多的脂肪，对预防心脑血管疾病、糖尿病和癌症有益。()

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A Welcome E-mail 欢迎邮件 Some international students are coming to your university. Write them an e-mail in the name of the Students Union to extend your welcome and provide some suggestions for their campus life here. Do not sign your own name at the end of the letter. Use "Li Ming" instead. Do not write the address.

“世界卫生日”是每年的4月7日。()

苍蝇可以传播霍乱、痢疾、伤寒、乙肝等疾病。()

接受阳光照射能提高人体对钙的吸收能力。()