Work in pairs. Look at the pictures and answer the questions.
1. How have these inventions changed people's lives?
2. Which one do you think is the most important?
3. What other important inventions can you think of?
Listen and complete the sentences.
1. Lingling loves her mobile phone because she can __u_s_e_i_t ___ __a_n_y_w_h_e_r_e__. 2. All of Daming’s friends’ number are _k_e_p_t__ in his phone. 3. Today’s cameras are better than old cameras because they do not _n_e_e_d_f_il_m__ and the photos can __b_e_s_e_n_t_b_y__e_m_a_i_l___. 4. Lingling thinks everything w__a_s_c_h_a_n_g_e_d_ by computers to some degree, so the computer is _t_h_e__m_o_s_t_i_m_p_o_r_t_a_n_t_ invention.
3. thousands of好几千; 成千上万 (1)thousands of表示一个不确定的数目, 前面不跟具体 数字, 后面跟复数名词。 (2)如果前面有具体数字修饰时，则thousand不加-s, 不 能与of连用。例如: two thousand trees 2 000棵树。 另外：hundred, million, billion等数词与thousand的用 法相同。
