1.【答案】B。
解析：Security is a key vulnerability of email: there is no guarantee of privacy (and a risk of accidentally sending the message to the wrong person). The other options are significant strengths, however. If you hesitated over the fourth option, think about how email can be used for memos/reports/letters, and how many formats (visual, audio) can be 'attached' to email messages.
知识点： Communicating in business
2.【答案】D。
解析：The grapevine is a ‘rumour mill': information is often inaccurate and exaggerated.
Communication is, however, fast, selective (in that information is not randomly passed on to everyone) and up-to-date (information is often more current than in the formal system).该小点考试常有涉及，需引起注意。
知识点：Communicating in business
